Navigate

The kinetic energy needed to project a body of mass m from the surface of earth

The kinetic energy needed to project a body of mass m from the surface of earth (radius R) to infinity is

Options

(a) mgR/2
(b) 2mgR
(c) mgR
(d) mgR/4

Correct Answer:

mgR

Explanation:

The kinetic energy =1/2MVe²
The escape velocity Ve=√2gR
Ve²=2gR
= 2mgR/2
=mgR

AIEEE2002
admin:

Related Questions

  1. A wire of one metre length carries a constant current. The wire is bent to form
  2. A beam of light contains two wavelengths 6500Å and 5200Å.
  3. If alpha, beta and gamma rays carry same momentum, which has the longest
  4. A charged particle (charge q) is moving in a circle of radius R with uniform speed v
  5. Weight of a body of mass m decreases by 1% when it is raised to height h